Well, one of my recent acomplishments is deciding to do Impromtu. My mom persuaded me to do it. She offered me a Breyer of my choice if I did it at all the tournaments we went to. Here is the one i picked. My mom does not like to call it a bribe, just a goal incentive. Impromtu is where you are given three topics. as soon as your receive your topics the timer gives you two minutes prep time. In this time you choose which one the three topics to speak on. Then in the remaining time you have you think of your thesis. Which is the main point you are trying to get across. After that you think of three points to support your thesis, and three examples to support those points. Then you may want to try to get a personal story as your introduction. This is a REALY good attention grabber! its quite hard! just an example of one is

Topic: Bravery

Thesis you chose: With God we can be brave.

Introduction: Going on the roof putting up christmas lights, I was scared but in the end I was brave about it.

1 Point: God helps us stand up for whats right
Example for that point: Corrie Ten Boom

2 Point: Without God its hard to be brave
Example for that point: Hagar, From Genesis

3 Point: Being brave can glorify God
Example for that point: Daniel and the lions den

Closer: All you do is just go over what you said and reinforce what you
said before and really driving your thesis home!

So that is the main gist of it.